Payroll System RFP Guide for UK Payroll Teams: Requirements, Controls and Parallel Runs
Choosing a new payroll system in the UK can feel risky. You’re dealing with people’s pay, HMRC deadlines, pensions, court orders, benefits, complex allowances – and zero tolerance for mistakes.
A clear, well-structured payroll RFP (Request for Proposal) helps you take control. It lets you define what “good” looks like, compare vendors on the things that actually matter, and protect your organisation against compliance and operational risks.
This guide is written for UK payroll, HR and finance teams who are about to run, or are thinking about running, a payroll system RFP. We’ll walk through:
- The key sections of a UK-ready payroll RFP
- How to capture requirements beyond basic “can you do payroll?” questions
- What to ask about controls, audits and compliance
- How to handle parallel runs and cutover planning from day one
We’ll also show where it makes sense to bring in external support – from structured
payroll system selection and
payroll system implementation
to
payroll system migration,
payroll health check & compliance
and
parallel payroll & cutover support.
1. When do you need a payroll system RFP?
Not every payroll project needs a full RFP. But you almost certainly do if:
- You are replacing a core payroll platform used across multiple entities or countries
- You operate in a regulated sector (e.g. financial services, public sector, utilities)
- You have complex pay rules, allowances, shifts or union agreements
- You are moving from in-house processing to an outsourced/managed solution, or vice versa
- You need a defensible, auditable decision for internal or external stakeholders
A good RFP fits inside a wider
payroll system selection process – market scan, long-list, short-list, demos, reference checks and commercial negotiation.
2. Core sections of a UK payroll RFP
You don’t need a huge document, but you do need structure. A practical UK payroll RFP usually includes:
- Organisation and payroll context
- Scope and supported populations
- Functional requirements
- Controls, audits and compliance
- Integrations and data flows
- Data migration and historical data handling
- Parallel runs, cutover and go-live strategy
- Service model and SLAs
- Security and GDPR
- Commercials and contract terms
Let’s unpack the critical areas in more detail.
3. Organisation and payroll context
This section gives vendors the context they need to answer properly, not just send boilerplate.
Include:
- Number of employees, workers and contractors (by country, entity and pay frequency)
- Current payroll model – in-house, bureau, BPO, local providers
- Current systems – HRIS, payroll, time & attendance, finance/ERP, benefits, pensions
- Work patterns – shifts, rotas, zero-hours, seasonal staff, casual workers
- Key issues with the current set-up (e.g. errors, late payments, limited reporting, over-reliance on key individuals)
- Drivers for change – compliance, consolidation, cost, control, experience, group standardisation
Example RFP question
“Describe how your payroll solution would support an organisation of our size and complexity, including multiple entities, pay frequencies and worker types.”
4. Scope and supported populations
Be precise about who and what is in scope for the new payroll solution.
Clarify:
- Countries in scope now and potentially in future
- Entities and headcount by pay frequency (weekly, fortnightly, four-weekly, monthly)
- Types of workers – salaried, hourly, casual, agency, contractors
- Which payroll processes are in scope – calculation only, payments, reporting, year-end, P11D, benefits, pensions
- Where the vendor is expected to advise vs simply execute your rules
Example RFP question
“Confirm which of our in-scope countries and worker types you currently support in production, including typical client examples.”
5. Functional payroll requirements
This is where you move beyond “do you support UK payroll?” into the detail of how well the system matches your real world.
Create a requirements matrix that covers at least:
- Core payroll – gross to net, statutory payments, HMRC submissions, student loans, court orders, maternity/paternity, etc.
- Pay rules – overtime, shift premiums, allowances, enhancements, call-out, standby, complex rotas
- Pensions and benefits – auto-enrolment, multiple schemes, salary sacrifice, benefit deductions
- Absence linkage – SSP, company sick pay, unpaid leave, holiday pay calculation (including variable pay)
- Retro and corrections – adjustments, back pay, mid-period changes, off-cycle runs
- Reporting – payroll journals, variance reports, statutory returns, internal management reporting
Example requirements table
| Area | Requirement | Priority | Vendor Response (O/C/D) | Comments |
|---|---|---|---|---|
| HMRC | Support UK RTI submissions including FPS, EPS and associated error handling | Must | ||
| Pensions | Handle multiple pension schemes with different contribution and eligibility rules | Must | ||
| Holiday pay | Calculate holiday pay based on 52-week average for variable-pay workers | Must | ||
| Allowances | Apply different allowances by site, role and shift pattern | Should |
This matrix then feeds directly into your
payroll system selection scoring, demos and UAT planning.
6. Controls, audits and compliance
For UK organisations, especially in regulated sectors, control and auditability can be more important than features.
Use the RFP to understand how each vendor supports:
- Segregation of duties – clear separation between those who set up pay rules, process pay, approve pay and release payments
- Approval workflows – who can approve pay runs, rate changes, new joiners, leavers and one-off payments
- Audit trails – robust logging of changes to employee data, pay elements, bank details and configuration
- Reconciliations – tools and reports to reconcile payroll to finance, bank payments and control accounts
- Compliance monitoring – alerts for threshold breaches, negative pay, unusual payments, HMRC errors
This links closely to broader
payroll health check & compliance work, where you might benchmark existing controls and design a stronger control framework alongside the new system.
Example RFP questions
- “Describe how your solution supports segregation of duties across configuration, processing, approval and payment.”
- “Provide examples of standard reports that support payroll reconciliations, variance analysis and audit review.”
7. Integrations and data flows
Payroll does not operate in isolation. Your RFP should be clear about where data comes from and where it must go.
Key integration areas:
- HRIS – employee master data, job, grade, cost centre, working patterns
- Time & attendance / rota – hours, shifts, overtime, premiums
- Finance/ERP – journals, cost allocations, accruals, reconciliations
- Banking – BACS payments, faster payments, international transfers
- Benefits and pensions – contributions, deductions, scheme files
Ask vendors to describe their standard integration options (APIs, SFTP, iPaaS) and how they are used in real client environments.
Example RFP question
“Describe your standard integration patterns for UK payroll with core HR, time & attendance and finance systems, including typical tools and technologies used.”
8. Data migration and historical records
Data migration is where many payroll projects are under-scoped. It has direct implications for compliance, employee experience and reporting.
Use your RFP to clarify:
- Which data will be migrated – core employee data, pay elements, balances, year-to-date values, historical payslips
- How many years of history are required for compliance and for practical query handling
- Who is responsible for data extraction, transformation, validation and sign-off
- How the vendor’s tools support data cleansing and checking prior to go-live
This is often a dedicated workstream, supported by
payroll system migration specialists, rather than an afterthought at the end of implementation.
Example RFP question
“Outline your standard approach to payroll data migration, including history, year-to-date balances and validation steps prior to go-live.”
9. Parallel runs and cutover planning
Parallel runs are one of the most critical elements of payroll implementation – and they need to be thought about at RFP stage, not the week before go-live.
Use the RFP to ask:
- How many parallel runs the vendor typically recommends for similar organisations
- What tools and reports exist for comparing legacy and new payroll results
- How variances are analysed, prioritised and resolved
- How sign-off is obtained from payroll, HR, finance and audit
- What go/no-go criteria are used before cutover
Well-designed parallel runs and cutover are usually supported by a dedicated workstream, often with specialist
parallel payroll & cutover support to keep the process structured and independent.
Example RFP questions
- “Describe your standard approach to payroll parallel runs, including number of cycles, variance thresholds and sign-off process.”
- “Provide examples of standard reports used to compare legacy vs new payroll output at employee and aggregate level.”
10. Service model, SLAs and vendor relationship
Once the system is live, you’ll be relying on the vendor’s service model every pay period. The RFP is your chance to understand it properly.
Clarify:
- Support channels, hours and response targets (particularly around pay days and year-end)
- How issues are prioritised and escalated
- Release and change cycles – how often updates are made and how they’re tested
- How configuration changes are managed and documented
- How you will work together on continuous improvement and control strengthening
This should tie back into your own internal approach to payroll governance and any broader
payroll health check & compliance programmes.
11. Implementation and project governance
Even the best payroll solution will fail if the implementation is under-resourced or poorly governed.
At RFP stage, ask vendors to outline:
- Their standard implementation methodology and timeline for organisations like yours
- Expected client resources (payroll, HR, IT, finance, data, testing)
- Project governance set-up – SteerCo, working groups, risk and issue management
- How they support change management and training for payroll, HR and managers
In many cases, you may decide to bring in independent experts for
payroll system implementation governance, ensuring the project is driven by your agenda, not just the vendor’s.
Example RFP question
“Provide a sample implementation plan for a UK organisation of our size, including key milestones for design, build, testing, parallel runs and cutover.”
Turning your payroll RFP into a safer decision
A good payroll RFP is more than a procurement exercise. It is the backbone of a safer, more controlled move to a new payroll platform.
If you get the requirements, controls and parallel run elements right, you will:
- Reduce the risk of pay errors during and after go-live
- Strengthen your control environment and audit position
- Give your execs and board a clearer view of risk and value
- Make it easier to own and improve payroll long after the project team disbands
For many organisations, the most effective approach is to combine internal expertise with external support – using specialist
payroll system selection,
implementation,
migration,
health checks
and
parallel run & cutover services to reduce risk and pressure on BAU teams.
FAQs: Payroll system RFPs for UK organisations
How long should a payroll system RFP be?
For most UK organisations, 20–30 pages plus supporting spreadsheets is usually enough. Focus on clear requirements, controls and process detail rather than sheer volume.
How many vendors should we invite to respond?
Three to five serious vendors is typically ideal. That gives you choice without overwhelming your payroll and HR teams with responses and demos.
Do we need separate RFPs for HR and payroll?
If you’re buying an integrated HR and payroll suite, a combined RFP can work, with dedicated sections for payroll. If payroll is particularly complex or high risk, it’s often worth treating it as its own workstream with more detailed requirements.
When should we start planning parallel runs?
Parallel run strategy should be discussed with vendors at RFP stage and built into your
payroll implementation plan. Treat it as a major phase, not an optional extra at the end.
What’s the link between an RFP and a payroll health check?
A
payroll health check & compliance review before your RFP can help identify existing control gaps, data issues and process weaknesses. You can then build specific requirements and controls into your RFP so the new solution actively addresses those risks.
